a proud fisherman is photographed next to his catch, which hanging from a spring scale supported by the ceiling of an elevator. the elevator is moving straight downwards, and slowing down at the rate of 2.45m/s^2. the spring scale reads 60N. find the weight of the fish

Question

a proud fisherman is photographed next to his catch, which hanging from a spring scale supported by the ceiling of an elevator. the elevator is moving straight downwards, and slowing down at the rate of 2.45m/s^2.  the spring scale reads 60N. find the weight of the fish

kropot72 · Answer

g = 9.81m/s^2
The resultant acceleration of the fish = 9.81 - 2.45 = 7.36m/s^2
Let the mass of the fish = m
60 = m * 7.36
m = 60/7.36kg
Now you have the mass of the fish, can you find the weight?

kropot72 · Answer

Weight = mass * g = (60/7.36) * 9.81 = ?

kropot72 · Answer

@dmbonu Are you there?

anonymous · Answer

the weight of the fish is 79, isnt that a high?

kropot72 · Answer

The weight of the fish is 79.97 Newtons. Obviously it is a big fish. The question says the fisherman is pround of it!

anonymous · Answer

thank you so much for your help i just figure it out. 60N is the upward force (the normal force), so we are meant to be looking for the downwards force. normal force= m(a+g)
so 60N=m(2.45m/s^2+9.8m/s^2)
m=4.89
weight=m*g
weight =48N

kropot72 · Answer

Sorry, my bad :(
You are correct. The resultant acceleration of the fish is (2.45 + 9.81)m/s^2.
Well done!

anonymous · Answer

thank you

kropot72 · Answer

You're welcome :)